Detecting blocking objects

ABSTRACT

A method and system of determining whether a stationary vehicle is a blocking vehicle to improve control of an autonomous vehicle. A perception engine may detect a stationary vehicle in an environment of the autonomous vehicle from sensor data received by the autonomous vehicle. Responsive to this detection, the perception engine may determine feature values of the environment of the vehicle from sensor data (e.g., features of the stationary vehicle, other object(s), the environment itself). The autonomous vehicle may input these feature values into a machine-learning model to determine a probability that the stationary vehicle is a blocking vehicle and use the probability to generate a trajectory to control motion of the autonomous vehicle.

RELATED APPLICATIONS

This application claims priority to U.S. patent application Ser. No.15/897,028, filed Feb. 14, 2018, which is incorporated herein byreference for all purposes.

BACKGROUND

Stationary objects, such as vehicles on a road, may interfere withautonomous operation of a vehicle. For example, a stationary vehicle infront of the autonomous vehicle may be double-parked, or otherwiseincapacitated, blocking the autonomous vehicle. Detecting such blockingvehicles may be limited by sensor visibility, as it may be impossible to“see” in front of the potentially blocking vehicle to determine if it isa blocking vehicle.

Furthermore, environmental cues may add to complexity of detection. Toenumerate two examples, a vehicle stopped at an intersection having adetected red light may be a blocking vehicle and not waiting on thetraffic light. Similarly, a vehicle stopped near an intersection havinga detected green light may, in fact, be waiting in a long line to make aturn and not be a blocking vehicle. Operating autonomously based onimproperly detected blocking vehicles may create additional problems,such as the inability for the autonomous vehicle to re-enter itsoriginal lane.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description is described with reference to the accompanyingfigures. In the figures, the left-most digit(s) of a reference numberidentify the figure in which the reference number first appears. Thesame reference numbers in different figures indicate similar oridentical items.

FIG. 1A illustrates an example scenario involving a stationary vehiclethat may be a blocking vehicle.

FIG. 1B illustrates an example depicting an autonomous vehicle view ofthe scenario of FIG. 1A, showing a portion of the scenario of FIG. 1Athat is discernable from sensor data collected by the autonomousvehicle.

FIG. 2 illustrates a pictorial flow diagram of an example process fordetecting blocking vehicles.

FIGS. 3A-3F illustrate examples of sensor data and features derivedtherefrom for detecting blocking vehicles.

FIG. 4 illustrates a block diagram of an example architecture fordetecting blocking vehicles that includes an example vehicle system.

FIG. 5 illustrates a flow diagram of an example process for training ablocking vehicle machine-learning model according to techniquesdiscussed herein.

FIG. 6 illustrates a schematic flow diagram of an example process fordetecting a blocking vehicle using a machine-learning model according totechniques discussed herein.

FIG. 7 illustrates a flow diagram of an example process for training ablocking vehicle machine-learning model according to techniquesdiscussed herein.

DETAILED DESCRIPTION

As above, blocking objects (including vehicles) include objects whichimpede an autonomous vehicle from proceeding along a planned route orpath. For example, in many urban environments, double parking is acommon practice. Such double-parked vehicles need to be detected asblocking vehicles to be treated separately from stationary vehicles.Particularly, while the autonomous vehicle may be instructed to wait fora stopped vehicle to move, the autonomous vehicle may be instructed tonavigate around such a double-parked vehicle. General rules, such astreating all stationary vehicles at green lights as blocking, are ofteninaccurate and/or insufficient for operating the autonomous vehiclesafely and/or in a manner that more closely mimics human operation of avehicle. This disclosure is generally directed to techniques (e.g.,machines, programs, processes) for determining whether a stationaryvehicle is a blocking vehicle, or object, in order to control anautonomous vehicle in light of this determination. In some examples, thetechniques discussed herein include a machine-learning (ML) modelconfigured to receive sensor data to determine whether to indicate thata stationary vehicle is a blocking vehicle. Instead of making thisdetermination according to a conditional rule (e.g., if it is true thata light is green and it is true that the vehicle is stopped, indicatethat the vehicle is a blocking vehicle), the techniques discussed hereinmay determine a probability that a stationary vehicle is a blockingvehicle, using an ML model that takes sensor data as input.

In some examples, techniques discussed herein may include receiving rawand/or processed sensor data (e.g., sensor data processed by anothermachine-learning model and/or software/hardware module of the autonomousvehicle) from sensor(s) and/or software and/or hardware modules of anautonomous vehicle, determining that a vehicle in a path of theautonomous vehicle is stationary, determining feature values from thesensor data (e.g., values indicating features such as a distance to thenext junction in the roadway; a distance from the stationary vehicle toa next vehicle in front of the stationary vehicle; speed, brake lightconditions, height, size, and/or yaw of the stationary vehicle; aclassification of the stationary vehicle and/or object(s) in thevicinity of the stationary vehicle; traffic flow data), and determininga probability that the stationary vehicle is a blocking vehicle. In someexamples, the probability may be determined using an ML model.

In some examples, the autonomous vehicle may include a perception engineand/or a planner for controlling the autonomous vehicle. The perceptionengine may include one or more ML models and/or othercomputer-executable instructions for detecting, identifying,classifying, and/or tracking objects from sensor data collected from theenvironment of the autonomous vehicle. In some examples, the perceptionengine may include the ML model configured to determine a probabilitythat the stationary vehicle is a blocking vehicle (referencedhereinafter as the “BV model,” although general discussion of ML modelsequally applies to the BV model). The planner may include one or more MLmodels, algorithms, etc. for route-planning, trajectory-planning,evaluating decisions, etc. The planner may be configured to generate atrajectory for controlling motion of the autonomous vehicle from datareceived from other components of the autonomous vehicle such as, forexample, the perception engine, sensor(s), data received from othervehicles and/or a network connection, a global and/or local mapcomponent, etc.

The techniques discussed herein improve operation of an autonomousvehicle by increasing accuracy of detections over prior solutions (e.g.,using conditional rules). Practically, the techniques result inpreventing the autonomous vehicle from unnecessarily sitting behind ablocking vehicle, which consequently reduces power consumption andwasted compute cycles by the vehicle. The techniques may also preventthe autonomous vehicle from unnecessarily changing lanes or re-routingwhen the stationary vehicle is a non-blocking stationary vehicle. Thismay similarly reduce power consumption and wasted compute cycles by thevehicle. The techniques may also improve safety of the autonomousvehicle's operation both to passengers of the autonomous vehicle and/orto entities of the environment by more accurately perceiving asituation. For example, the techniques may prevent the autonomousvehicle from lane-changing only to have to return to the original lanethat is occupied by a line of cars not previously perceived by theautonomous vehicle (e.g., which may present an increased collisionhazard), encountering an object that the non-blocking stationary vehiclehad paused for, anticipating that door(s) of the non-blocking stationaryvehicle may open and avoiding hitting them, etc.

As used herein, a blocking vehicle is a stationary vehicle on a drivablesurface that impedes other vehicles from making progress in some manner.Not all stationary vehicles on drivable surfaces are blocking vehicles.For example, a non-blocking stationary vehicle may be a vehicle that haspaused its progress on a drivable road surface for a traffic lightsignaling a red light, to yield to another vehicle and/or to wait foranother vehicle to make progress, for an object that crosses in front ofthe vehicle, etc. In contrast, a blocking vehicle may be a double-parkedvehicle, a delivery truck that has been parked to make a delivery, avehicle that a driver vacated, a stopped police car, an incapacitatedvehicle, etc. The difference between a non-blocking stationary vehicleand a blocking vehicle may be ambiguous and difficult to determinesince, in most cases, the difference may be only a matter of length oftime for which the stationary vehicle is stopped. However, the primarydifference between a stationary vehicle and a blocking vehicle is thatprogress of a vehicle would otherwise be possible and/or permitted butfor the existence of the blocking vehicle. In some examples, theblocking vehicle may be categorized as a stationary vehicle which is notobeying generally accepted rules of the road, such as proceeding along alane. The techniques discussed herein improve operation of autonomousvehicles by preventing the autonomous vehicle from stopping behind ablocking vehicle for an untenable duration of time.

Example Scenario

FIG. 1A is a schematic aerial view of an example scenario 100 thatillustrates one instance of many for which techniques discussed hereinmay be applied. In the example scenario, an autonomous vehicle 102approaches a roadway junction 104 that includes a traffic light 106. Insome examples, the autonomous vehicle 102 may be an autonomous vehicleconfigured to operate according to a Level 5 classification issued bythe U.S. National Highway Traffic Safety Administration, which describesa vehicle capable of performing all safety-critical functions for theentire trip, with the driver (or occupant) not being expected to controlthe vehicle at any time. However, in other examples, the autonomousvehicle 102 may be a fully or partially autonomous vehicle having anyother level or classification now in existence or developed in thefuture. Moreover, in some examples, the techniques described herein fordetermining blocking vehicles may be usable by non-autonomous vehiclesas well.

The autonomous vehicle 102 may receive sensor data from one or moresensors of the autonomous vehicle 102. The autonomous vehicle 102 mayuse this sensor data to determine a trajectory for controlling motion ofthe autonomous vehicle. In some examples, the autonomous vehicle 102 mayinclude a planner that receives a data from the sensor(s) and/or aperception engine, among other hardware and software modules. Forexample, this data may include a position of the autonomous vehicle 102determined by a global-positioning system (GPS) sensor, data related toobjects in the vicinity of the autonomous vehicle 102, route data thatspecifies a destination of the vehicle, global map data that identifiescharacteristics of roadways (e.g. features detectable in differentsensor modalities useful for localizing the autonomous vehicle), localmap data that identifies characteristics detected in proximity to thevehicle (e.g., locations and/or dimensions of buildings, trees, fences,fire hydrants, stop signs, and any other feature detectable in varioussensor modalities), etc. The planner may use this data to generate atrajectory for controlling motion of the vehicle. In some examples, theautonomous vehicle 102 may include a perception engine that receivessensor data from one or more sensors of the vehicle 102, determinesperception data from the sensor data, and transmits the perception datato the planner for use by the planner to localize a position of theautonomous vehicle 102 on the global map, determine one or moretrajectories, and control motion of the autonomous vehicle 102 totraverse a path or route. For example, the planner may determine a routefor the autonomous vehicle 102 from a first location to a secondlocation, generate potential trajectories for controlling motion of theautonomous vehicle 102 for windows of time (e.g., 1 micro-second, half asecond) to control the vehicle to traverse the route, and select one ofthe potential trajectories as a trajectory of the autonomous vehicle 102that may be used to generate a drive control signal that may betransmitted to drive components of the autonomous vehicle 102.

The perception engine may include one or more ML models and/or othercomputer-executable instructions for detecting, identifying, segmenting,classifying, and/or tracking objects from sensor data collected from theenvironment of the autonomous vehicle 102. For example, the perceptionengine may detect an object in the environment and classify the object(e.g., passenger vehicle, semi-truck, pickup truck, human, child, dog,ball). The perception engine may also determine a track of the object(e.g., historical, current, and/or predicted heading, position,velocity, and/or acceleration of the object).

The perception engine may determine that a vehicle is a stationaryvehicle based, at least in part, on sensor data received from one ormore sensors of the autonomous vehicle. In some examples, the perceptionengine may receive sensor data and, based, at least in part, on thesensor data detect an object in the environment of the autonomousvehicle 102, classify that object as some type of vehicle, and determinethat the sensor data indicates that a velocity of the detected vehicledoes not exceed a predetermined threshold velocity (e.g., a sensedvelocity of the vehicle is not greater than or equal to 0.1 meters persecond or 0.05 meters per second). As used herein a vehicle may be, forexample and without limitation, a means of physical transportation suchas a passenger vehicle, a delivery truck, a bicycle, a drone fortransporting objects, etc. In some examples, the perception engine mayclassify the detected vehicle as a stationary vehicle based on adetermination that a velocity of the stationary vehicle does not satisfy(e.g. meet, exceed) a predetermined threshold velocity and/or thatanother condition is satisfied such as, for example, a duration of time,a traffic light condition, a sensed distance from a junction satisfies apredetermined threshold distance, etc. For example, the perceptionengine may classify a detected vehicle as a stationary vehicle based, atleast in part, on receiving sensor data it determines to be indicativeof the detected vehicle going slower than a predetermine thresholdvelocity (e.g., the vehicle is stopped) and that the vehicle has beengoing slower than the predetermined threshold velocity for apredetermined amount of time (e.g., the vehicle has been stopped for 20seconds) while a traffic light indicates a green light and/or at adistance of 100 meters from the junction.

Returning to the example scenario in FIG. 1A, the autonomous vehicle 102may approach a junction 104 that includes a traffic light 106 and mayencounter an object that it classifies as a stationary vehicle (e.g.,vehicle 108), which is also indicated with a question mark in theillustration. The technical difficulty that arises is when theperception engine does not have sufficient information to know whetherthe stationary vehicle is merely paused (i.e., a non-blocking stationaryvehicle), being itself obstructed by another object and/or legalconstraint (e.g., a stop light), or whether the stationary vehicle isactually a blocking vehicle. As used herein, a blocking vehicle is avehicle on a drivable road surface that is stopped or moving at avelocity less than a predetermined threshold velocity that impedesprogress of other vehicles. For example, a blocking vehicle might be adouble-parked vehicle, a delivery truck from which goods are beingunloaded, a vehicle that a driver vacated or whose driver is waiting topick up passengers, a stopped police car, an incapacitated vehicle(e.g., a vehicle that has a failed drive system, a vehicle with a flattire, a vehicle involved in a vehicle accident, a vehicle whose occupanthas vacated the vehicle), or a meter-reading patrol vehicle. As usedherein a “drivable road surface” may include those portions associatedwith a roadway associated with normative driving conditions, as opposedto a non-drivable road surface, such as a shoulder, parking lane, and/ora bike lane.

A blocking vehicle may be different than a non-blocking stationaryvehicle in that a non-blocking stationary vehicle is stopped when noother vehicles could make progress anyway (or otherwise in accordancewith generally accepted driving rules), therefore the non-blockingstationary vehicle does not impede the other vehicles, per se, (e.g., atraffic light is red, an object has entered the road, the stationaryvehicle has another vehicle in front of it). As discussed herein, theblocking vehicle may differ from a non-blocking stationary vehicles inthat the blocking vehicle impedes a trajectory determined by theautonomous vehicle 102 (e.g., the blocking vehicle occupies at leastpart of a same lane as the autonomous vehicle 102 and/or coincides witha path and/or trajectory of the autonomous vehicle 102).

Without resolving the ambiguity of whether a detected vehicle is anon-blocking stationary vehicle or whether the detected vehicle is ablocking vehicle, the perception engine may provide insufficient data tothe planner for the planner to generate a trajectory that controlsmotion of the autonomous vehicle 102 appropriately given the scenario.

FIG. 1B illustrates an aerial view of the same example scenario 100 ofFIG. 1A and reflects a further complication of the example scenario 100.In particular, FIG. 1B reflects the limited and imperfect view of thescenario available to the autonomous vehicle 102 via the sensor data.Future sensor and perception advances will likely increase the portionof a scenario reflected in sensor data, but it remains likely that theautonomous vehicle 102 will not be apprised of 100% of the states,objects, etc. in or having an effect on a scenario, at least some of thetime. FIG. 1B therefore reflects an example portion of the scenario 100that is reflected by sensor data received by a planner of the autonomousvehicle 102. For example, global map data and a GPS location receivedfrom a sensor of the autonomous vehicle 102 might indicate that ajunction 104 lies 100 meters in front of the autonomous vehicle 102;sensor data may indicate that the traffic light 106 is green and, incoordination with global map data lidar data, and/or camera data (thoughany other sensor modality is contemplated), the perception engine maycorroborate that the autonomous vehicle 102 is in a lane that isauthorized to enter the junction 104 based on the green light; theautonomous vehicle 102 may receive sensor data from which the autonomousvehicle determines that vehicle 108 and vehicles 110 and 112 arestationary vehicles.

Because of limitations of the sensor(s), the autonomous vehicle 102 maynot receive sensor data to detect the existence of vehicles 114-122. Forexample, vehicle 114-122 might be outside a field of view of a sensor,beyond a reliable operational distance of a sensor, or occluded. In someexamples, the perception engine may include conditional rules thatspecify conditions for which to output a blocking vehicle indication. Insome examples, the conditional rules may be hard-coded in advance by aprogrammer or administrator. For example, a hard-coded rule may specifythat the perception engine outputs a blocking vehicle indication when adetected vehicle has been classified as a stationary vehicle, a greenlight has been detected and has remained green for a predeterminedduration of time during which the stationary vehicle has not moved, andthe stationary vehicle is over 15 meters from the junction 104.

However, such hard-coded rules may not properly account for manypotential scenarios. For instance, the example hard-coded rule givenabove might work for an example where the stationary vehicle 108 wasincapacitated and was therefore blocking vehicle 108. However, as FIG.1A illustrates, there may actually be a long line of cars in front ofthe stationary vehicle 108 which may be undetectable by the autonomousvehicle 102. Therefore, providing a blocking vehicle indication to theplanner for example scenario 100 may produce erroneous or troublesomeoperation of the autonomous vehicle 102. For example, the planner mightinitiate a lane change, assuming that the autonomous vehicle 102 wouldbe able to return to the same lane after passing the stationary vehicle108 that has been indicated by the perception engine as being a blockingvehicle. Because of the long line of cars that exists in front of thestationary vehicle, the autonomous vehicle 102 may be unable to returnto the original lane. Classifying the stationary vehicle 108 as ablocking vehicle in this situation would therefore be a false positive.False negatives may similarly disrupt operation of the autonomousvehicle 102. Hard-coded rules may therefore create unacceptable rates offalse positives and/or false negatives.

Furthermore, introducing a new feature (e.g., checking whether theperception engine detects that the stationary vehicle's hazard lightsare flashing) to a set of hard-coded rules would be time-intensive andrequire human coding and/or re-configuration of the perception engine.This is undesirable since such re-configuration may require stopping theautonomous vehicle 102 from operating and/or waiting for humanre-configuration to be completed, which may require multiple iterationsof developing and testing new re-configurations of the perceptionengine.

In some examples, the techniques discussed herein may, instead,probabilistically determine whether a stationary vehicle is a blockingvehicle via an ML model that is not so limited. This approach isdescribed herein in association with the BV ML model.

Example Process

FIG. 2 illustrates a pictorial flow diagram of an example process 200for determining, at an autonomous vehicle, whether a stationary vehicleis a blocking vehicle in order to control the autonomous vehicle. Atoperation 202, the example process 200 may include receiving sensor datafrom sensor(s) of an autonomous vehicle 204. In some examples, thesensor data may be additionally or alternatively received from remotesensor(s) such as sensor(s) of another vehicle, sensor(s) of a remotecomputing device (e.g., a teleoperations service, a weather station, atraffic control service, an emergency service), and/or sensor(s) locatedin infrastructure (e.g. sensors(s) located on light posts, buildings).

At operation 206, the example process 200 may include detecting astationary vehicle 208 from the sensor data. This may include detectingan object, classifying that object as a vehicle, and determining that avelocity (or speed) of the vehicle is less than a threshold velocity (orspeed). In some examples, the threshold may be a predetermined threshold(e.g., the vehicle is stopped or moving at less than 0.05 meters persecond), while in other examples the threshold may be relative (e.g.,the vehicle is moving at less than 20% of the average velocity oftraffic). In some examples, operation 206 may additionally oralternatively include determining that other features determined fromthe sensor data meet one or more conditions, such as the vehiclesatisfies a distance from a junction, the vehicle is of a particulartype (e.g., bike, passenger vehicle), a light traffic light signal isgreen, etc.

The operation 206 may include detecting all stationary vehicles within“sight” of the sensors of the autonomous vehicle 204 (i.e. thosevehicles which are within a field of view of the one or more sensors).In additional or alternate examples, operation 206 may include detectingthe stationary vehicles within a predetermined threshold distance. Forexample, the autonomous vehicle 204 may detect the stationary vehicleswithin 50 meters. By limiting how far the autonomous vehicle 204 detectsstationary vehicles, the autonomous vehicle 204 conserves processing andstorage resources. Additionally, by detecting more than just whether astationary vehicle exists in a same lane as the autonomous vehicle 204,the planner of the autonomous vehicle 204 is able to make moresophisticated decisions about which trajectory to generate and/or chooseto control the autonomous vehicle 204.

At operation 208, the example process 200 may include determiningfeature values 210 based at least in part on the sensor data. In someexamples, the feature values 210 may correspond to features specified bya blocking vehicle (BV) ML model. The BV ML model may be configured todetermine a probability of whether the stationary vehicle 208 is ablocking vehicle based on feature values 210 determined by a perceptionengine of the autonomous vehicle 204. In some examples, the autonomousvehicle 204 may attempt to determine feature values 210 for at least asubset of possible features for which the BV ML model is configured. Forexample, the table below illustrates an example of feature values 210determined by the perception engine that correspond to features uponwhich the BV ML may rely on to determine the probability that thestationary vehicle 208 is a blocking vehicle. In the example given, somefeature values 210 were either not determined by the perception engineor were not applicable or available from the sensor data (i.e., “Blockedby Another Object,” “Other Object Behavior”). Some of these features,and others, are discussed in regards to FIGS. 3A-3F.

Feature Feature Value Distance from Junction 14.3 meters Brake Lights on0 SV Speed .001 m/s Traffic Flow Normality .87 Blocked by Another Object— Person Near Vehicle 0 Other Object Behavior — Type of Agent “PassengerVehicle”

Though several example features are listed above (and with respect toFIGS. 3A-3F), the number and types of features are not to be solimiting. For example, any number of features are contemplated such as,for example, object bounding box size, object color, object height,object size, object width, an object velocity (i.e. a speed and/ordirection), object yaw (e.g., relative to an orientation of thevehicle), lane identification (e.g. left, center, right), a GPSlocation, detected logo and/or text associated with the stationaryvehicle, etc. Any of the features may be represented by simply Booleanvalues (i.e. the feature is present or not), real numbers (such asdetected speed), text (such as classification), or any otherrepresentation of data.

In some examples, the feature values 210 determined by the perceptionengine may include at least one of a speed of the stationary vehicle208, traffic signal state (e.g., traffic light state, existence oftraffic sign), traffic flow data, a relation of stationary vehicle datato traffic flow data (e.g., is the stationary vehicle data within anormal distribution of the traffic flow data), a probability that thestationary vehicle 208 is blocked by another object (e.g., based ondetecting a residual in sensor data that may indicate existence of anobject in front of the stationary vehicle 208), a probability that anoccluded object exists that may be indicated by a sensor residual (e.g.,noisy radar sensor data that may indicate an object in front of thestationary vehicle 208), a detected person near the stationary vehicle208 and related data (e.g., proximity of the person to the stationaryvehicle, whether the person leaves and returns to the stationary vehicle208), behavior of other objects (e.g., other vehicles are going aroundthe stationary vehicle 208, other vehicles are not going around thestationary vehicle 208), a classification label (type) of the stationaryvehicle 208 (e.g., police car, passenger vehicle, delivery truck) and/orother objects in the environment, door open/closed condition (e.g., aback door or some aperture of the stationary vehicle 208 isopen/closed), etc.

At operation 212, the example process 200 may include determining, usingthe BV ML model 214 and from the feature values, a probability that thestationary vehicle 208 is a blocking vehicle. For instance, the featurevalues 210 may be input into the BV ML model 214 and the BV ML model 214may, in response and according to the configuration of the BV ML model214, output a probability that the stationary vehicle 208 is a blockingvehicle. In some examples, the BV ML model 214 may include a decisiontree or any arrangement thereof, such as a random forest and/or boostedensemble of decision trees; a directed acyclic graph (DAG) (e.g., wherethe nodes are organized as a Bayesian network); deep learningalgorithm(s), such as a artificial neural networks (ANN), deep beliefnetwork (DBN), deep stacking network (DSN), or recurrent neural network(RNN); etc. In some examples, the BV ML model 214 may include agradient-boosted decision tree.

For example, where the BV ML model 214 includes a decision tree, thedecision tree may output a positive or negative number to indicate thatthe stationary vehicle 208 is or is not a blocking vehicle,respectively. In some examples, the BV ML model 214 may include aplurality of decision trees, which may be weighted. For example, onedecision tree may be weighted to output a −1.63 or +1.63 and a seconddecision tree may be weighted to output a −0.76 or +0.76. Once all ofthe decision trees have output a number, the perception engine may sumtheir outputs to determine a sum probability that the stationary vehicle208 is a blocking vehicle.

Where the BV ML model 214 includes a neural network, the BV ML model 214may include an input layer of nodes, one or more hidden layer of nodes,and an output layer of nodes. In some examples, the input layer of nodesmay be configured to receive the one or more feature values and activatenodes of the one or more hidden layers. The output layer may beconfigured to receive stimuli from nodes of the one or more hiddenlayers and to output the indication based on nodes of the output layerthat are most activated. In some examples, the output layer may comprisetwo nodes (a positive indication that the stationary vehicle is ablocking vehicle and a negative indication) and/or the output layerprovide an output between a strong confidence that the stationaryvehicle is a blocking vehicle and strong confidence that the stationaryvehicle is not a blocking vehicle. In some examples, the decision treemay be a classification tree in which an output comprises whether or notthe detected vehicle is a blocking vehicle.

In some examples, the BV ML model 214 may be generated (learned) fromlabeled feature data. For example, the BV ML model 214 may include adeep-learning model that learns to output a probability that astationary vehicle 208 is a blocking vehicle based on input samplefeature values that are associated with labels that indicate whether thesample feature values came from scenario where a stationary vehicle 208was a blocking vehicle or not (i.e., a ground truth label). FIG. 2illustrates the BV ML 214 as a decision tree, where the shaded nodes arenodes reached by input feature values. The illustrated decision tree mayoutput a weighted probability that the stationary vehicle 208 is ablocking vehicle equal to 0.623. In some examples, positive values maybe an indication that the stationary vehicle 208 is a blocking vehicleand negative values may be an indication that the stationary vehicle 208is not a blocking vehicle, though any sign value is contemplated (e.g.the reverse).

At operation 216, the example process 200 may include transmitting theprobability determined by the perception engine to a planner thatdetermines a trajectory for controlling the autonomous vehicle, asdepicted at 218 and 220. The planner may use the probability indicatingwhether the stationary vehicle 208 is a blocking vehicle to generate atrajectory with which to control the autonomous vehicle 204. Forexample, FIG. 2 illustrates two example trajectories that the plannermight determine in alternate scenarios.

In example scenario 218, the perception engine may have output anindication that the stationary vehicle 208 is a blocking vehicle.Responsive to receiving this indication, the planner of the autonomousvehicle 204 may generate a trajectory 222 that causes the autonomousvehicle 204 to merge into another lane. In some examples, the perceptionengine may additionally provide a classification of blocking vehicle tothe planner (e.g., police car, meter reader vehicle, delivery vehicle).In some examples, the classification may be a semantic label. Thissemantic label may be included as one of the feature values.

In example scenario 220, the perception engine may have output anindication that the stationary vehicle 208 is not a blocking vehicle(i.e., the stationary vehicle 208 is a non-blocking stationary vehicle).Responsive to receiving this indication, the planner of the autonomousvehicle 204 may generate a trajectory 224 that causes the autonomousvehicle 204 to creep forward in the same lane.

In some examples, the perception engine and/or planner may determine totransmit a signal to a remote computing device to receive remoteassistance. For example, the autonomous vehicle 204 may transmit asignal to a remote computing device, which may have greater computingpower, so that the remote computing device may determine the probabilityor for a human teleoperator to input an indication that the stationaryvehicle 208 is or is not a blocking vehicle. The planner may transmit asignal to the remote computing device if the probability does notsatisfy a threshold negative or positive probability, which may indicatea low confidence that the stationary vehicle 208 is or is not a blockingvehicle (e.g., the threshold may be 0.25, defining a probability thatmay be too low to rely on to generate a trajectory). In some examples,the autonomous vehicle 204 may also transmit sensor data and/or featurevalues to the remote computing device.

Example Features

FIGS. 3A-3F depict a variety of features that BV ML model may beconfigured to use to generate a probability that a stationary vehicle isor is not a blocking vehicle. Feature values discussed below may bedetermined by the perception engine from sensor data. Moreover, theoperations discussed below may be accomplished as a part of operation212 of FIG. 2 .

FIG. 3A depicts an example scenario 300 where an autonomous vehicle 302approaches a stationary vehicle 304 and a junction 306 that includes atraffic signal 308 (in this example a traffic light). Autonomous vehicle302 may correspond to autonomous vehicle 204 and the discussionpertinent thereto. The autonomous vehicle 302 may detect that thevehicle 304 is a stationary vehicle by a perception engine according toany of the techniques discussed herein. Responsive to detecting that thevehicle 304 is a stationary vehicle, the autonomous vehicle 302 maydetermine, by the perception engine, feature values from the sensordata. For example, the autonomous vehicle 302 may determine a conditionof lights of the stationary vehicle 304 (e.g., hazard lights on/off,brake lights on/off) as shown at 310; a distance 312 of the stationaryvehicle 304 (and/or the autonomous vehicle) from the junction 306 and/ora distance from the stationary vehicle 304 to a next vehicle in front ofthe stationary vehicle (as may be determined, for example, where theroadway is curved, where a sensor residual is available that mayindicate the existence of a vehicle in front of the stationary vehicle304 (such as RADAR reflections), etc); and/or a state of a trafficsignal 308, which may, in some examples, include a traffic light and/orthe existence or absence of traffic signage (e.g., green light, yellowlight, red light, existence of a stop sign, existence of a yield sign,absence of any detected signage, absence of a detected stop sign). Insome examples, the autonomous vehicle 302 may determine a height and/orsize of the stationary vehicle 304. In some instances, the height of theautonomous vehicle may be found by the BV ML model to be indicative ofthe likelihood that the stationary vehicle 304 is a blocking vehicle(e.g., semi-trucks and delivery trucks tend to be taller and tend tolonger stops in manners that obstruct portions of the roadway).

In some examples, the perception engine may additionally oralternatively determine logo and/or text associated with the stationaryvehicle 304 as one of the feature values. For example, amachine-learning algorithm of the planner may determine that thestationary vehicle 304 is associated with a pizza delivery sign (e.g.,on top of the vehicle), a taxi service sign, a text and/or a logo (e.g.,UPS text and/or logo, Uber text and/or logo). In some examples, the textand/or logo may be classified or used to strengthen the confidence of aclassification of a type of the stationary vehicle 304 (e.g., deliveryvehicle, public transportation vehicle).

In some examples, the perception engine may additionally oralternatively determine traffic flow data from the sensor data. Trafficflow data may include data for additional objects classified as avehicles as detected by the perception engine (i.e., vehicles 314, 316,and 318). This data may include a velocity 320 of a vehicle, a distance322 between the vehicle and a next and/or previous vehicle, etc.

For example, FIG. 3B shows an example distribution 324 of traffic flowdata. In some examples, such a distribution may reflect the frequency ofvarious detected feature values related to other objects (e.g. as adistribution, histogram). This may include a distribution of velocitiesof other vehicles determined by the perception engine. The exampledistribution 324 shows that the perception engine has determined that amajority of the detected vehicles are moving at a velocity betweenapproximately 55 kilometers per hour and 110 kilometers per hour.Although velocity is portrayed in FIG. 3B and discussed herein, it isunderstood that any other feature value that may be unique to eachvehicle may also be represented in a distribution. For example, distancebetween vehicles, door open/closed, person-near-vehicle, traffic lightindication, etc. may be unique to each vehicle (or to a lane ofvehicles), whereas some traffic light indications, etc. may not. For thesake of clarity, when referring to a frequency distribution of featurevalues of other vehicles, such feature values are termed “traffic flowdata” herein.

The perception engine may use a frequency distribution of traffic flowdata associated with detected vehicles to output a feature value thatincludes at least one of a percentile of the traffic flow dataassociated with the stationary vehicle 304, characteristics of thedistribution (e.g., whether the distribution includes a long tail,whether a long tail is eliminated by reducing traffic flow datareflected in the distribution to vehicles of particular lane(s), thewidth of the distribution, the height of the distribution), whethertraffic flow data associated with the stationary vehicle 304 lies withina tail, etc. For example, FIG. 3B depicts thresholds 326 and 328, whichmay indicate a quartile location and/or a percentile (e.g., 5^(th) and95^(th) percentiles, respectively). The perception engine may use thesethresholds 326 and/or 328 to indicate whether a velocity and/or anotherfeature value associated with the stationary vehicle 304 is within thebody of the distribution (of feature values of other observed vehicles)or in a tail defined by the thresholds 326 and/or 328. For example, theperception engine may determine whether a velocity and/or anotherfeature value associated with the stationary vehicle 304 is within oroutside two standard deviations of the mean of a Gaussian distribution.Regardless of what method is used, if the perception engine determinesthat the velocity and/or other feature value is outside the normal range(as discussed above), the perception engine may determine that thevelocity and/or other feature value of the stationary vehicle 304 isanomalous.

It is understood that the perception engine may otherwise use trafficflow data to identify corresponding data of stationary vehicle 304 asbeing anomalous. Note that, although it is more likely that a stationaryvehicle 304 would fall into the lower tail, in some examples, the uppertail may be used for other purposes, such as identifying an erraticvehicle.

In some examples, the perception data may generate traffic flow data forvehicles of a same type or general classification as the stationaryvehicle. For example, where the stationary vehicle 304 has beenclassified as a bicycle, the perception engine may generate traffic flowdata for other bicycles that the perception engine has detected. Inanother example, where the stationary vehicle 304 has been classified asa passenger vehicle the perception engine may generate traffic flow datafor objects classified as vehicles, passenger vehicles, and/or motorvehicles.

FIG. 3C depicts an additional or alternate feature 330 for which theperception engine may determine a feature value. The perception engineof the autonomous vehicle 302 may generate a feature value thatindicates behavior of other objects in relation to the stationaryvehicle 304. For example, the perception engine may store a track 334 ofanother vehicle, such as vehicle 332, and may output the track as afeature value.

In additional or alternate examples, the perception engine may output anindication that classifies the track as the feature value. For example,the indication may include an indication that the vehicle 332 ischanging lanes, remaining stationary, etc. As with traffic flow data,the perception engine may relay a frequency with which other objectsrepeat a behavior. In some examples, this frequency may be constrictedto objects that are in a same lane as the autonomous vehicle 302 or maybe more heavily weighted for objects that exhibit behavior thatoriginated in a lane of the autonomous vehicle 302. For instance,vehicles 336 and 338 may be parked vehicles. Since vehicles 336 and 338are in a different lane, constraining a determination of a frequency ofa behavior exhibited by other vehicles to a same lane of the autonomousvehicle 302 may increase accuracy of the trajectory generated by theplanner in response to receiving the determined frequency. For example,if the determination was not constrained to a same lane of theautonomous vehicle 302, the feature value may indicate that 2 vehicles(66% of vehicle behavior exhibited) have remained stationary and 1vehicle (33% of vehicle behavior exhibited) have passed the stationaryvehicle. Whereas, by constraining the determination to the frequency ofbehavior in the same lane of the autonomous vehicle 302, this featurevalue may indicate that 1 vehicle (100% of vehicle behavior exhibited)has passed the stationary vehicle.

In an additional or alternate example, the autonomous vehicle 302 maydetect all stationary vehicles (i.e. those vehicles not solely thoseconstrained to a same lane) within a range of the sensors of theautonomous vehicle 302 or within a predetermined threshold distance ofthe autonomous vehicle 302 (e.g., 50 meters, 100 meters). In such anexample, information regarding a stationary vehicle in other lanes maybe used in planning how other vehicles may react (e.g. planning a routeinto the lane of the autonomous vehicle and around a double-parkedvehicle). A feature value may reflect the location and/or other featurevalues associated with these other detected stationary vehicles.

FIG. 3D depicts an additional or alternate feature 340. The shadedportion of FIG. 3D indicates an area 342 of the environment that isoccluded to at least one of the sensors of the autonomous vehicle 302(e.g., by surfaces of the stationary vehicle 304). The perception engineof the autonomous vehicle 302 may generate a feature value thatindicates a probability that there is an occluded object 344 in front ofthe stationary vehicle 304 or otherwise in the occlusion area 342.

In some examples, the perception engine may determine that the sensordata includes a residual that may indicate the existence of the occludedobject 344. For example, the residual may include a portion of animage/video that indicates the existence of an object but isunclassifiable, a SONAR and/or RADAR anomaly, etc. Taking RADAR as anexample, the perception engine may determine a probability that theoccluded object 344 exists based on determining a portion of the RADARdata that is attributable to the vehicle and/or other identifiedenvironmental objects (e.g., the roadway) and determining that aresidual of the RADAR data may indicate the existence of the occludedobject 344. For example, the RADAR data may include reflections thatnoisily indicate the existence of an object that is a distance from theautonomous vehicle 302 that exceeds a distance from the autonomousvehicle 302 to the stationary vehicle 304. These noisy reflections maybe refracted from the occluded object 344 to a RADAR sensor of theautonomous vehicle under the undercarriage of the stationary vehicle 304in some instances and/or via a nearby object (e.g., a wall).

In some examples, the feature values may include a distance from thestationary vehicle 304 to the object 344. This may include exampleswhere the object 344 is occluded from direct sensor “view” or inexamples where the object 344 is at least partly within “view” of thesensors.

FIG. 3E depicts an additional or alternate feature 346 for which theperception engine may determine a feature value. The perception engineof the autonomous vehicle 302 may generate a feature value thatindicates the existence of a person 348 near the stationary vehicle 304.In some examples, the feature value may indicate a distance between theperson 346 and the stationary vehicle 304, whether the person 348 leavesand returns to the stationary vehicle 304, a number of persons near thestationary vehicle 304, and/or whether a door or other aperture of thestationary vehicle 304 is open. In some examples, the feature values mayadditionally or alternatively indicate a yaw 350 of the stationaryvehicle 304. The yaw may be determined relative to a pose of theautonomous vehicle 302 and/or relative to a direction of a lane. FIG. 3Edepicts an example where the yaw 350 is determined relative to both aheading of the autonomous vehicle 302 and the lane since the heading andlane lie parallel in the depicted example.

FIG. 3F depicts an additional or alternate feature 352 for which theperception engine may determine a feature value. The perception engineof the autonomous vehicle 302 may generate a feature value thatindicates classifications of detected objects (e.g., delivery truck,cone, flagger, flare) and/or meta-classifications describe a group ofclassifications (e.g., delivery, construction zone, incapacitatedvehicle).

In sum, the perception engine may determine one or more feature values(e.g., 15 meters from stationary vehicle to junction, “delivery truck,”green light, traffic flow data including the velocities of otherdetected vehicles and/or an indication of whether a velocity of thestationary vehicle is anomalous compared to all other vehicles, vehiclesof a same lane, or another subset of detected vehicles) that correspondto feature(s) upon which the BV ML model has been trained. The BV MLmodel may push these, and any other, feature values through nodes of theBV ML model to determine a probability that the stationary vehicle is ablocking vehicle.

Example Architecture

FIG. 4 is a block diagram of an example architecture 400 including anexample vehicle system 402 for controlling operation of at least onevehicle, such as an autonomous vehicle, according to any of thetechniques discussed herein. In some examples, the vehicle system 402may represent at least a portion of autonomous vehicle 204 and/or 302.In some examples, this architecture may be used to control an autonomousvehicle that encounters a stationary vehicle.

In some examples, the vehicle system 402 may include processor(s) 404and/or memory 406. These elements are illustrated in combination in FIG.4 , although it is understood that they may be separate elements of thevehicle system 402, and that components of the system may be implementedas hardware and/or software, in some examples.

Processor(s) 404 may include a uniprocessor system including oneprocessor, or a multiprocessor system including several processors(e.g., two, four, eight, or another suitable number). The processor(s)404 may be any suitable processor capable of executing instructions. Forexample, in various implementations, the processor(s) may begeneral-purpose or embedded processors implementing any of a variety ofinstruction set architectures (ISAs), such as the x86, PowerPC, SPARC,or MIPS ISAs, or any other suitable ISA. In multiprocessor systems, eachprocessor 404 may commonly, but not necessarily, implement the same ISA.In some examples, the processor(s) 404 may include a central processingunit (CPU), a graphics processing unit (GPU), Field Programmable GateArrays (FPGA), Application Specific Integrated Circuit (ASIC), or acombination thereof.

The example vehicle system 402 may include memory 406. In some examples,the memory 406 may include a non-transitory computer readable mediaconfigured to store executable instructions/modules, data, and/or dataitems accessible by the processor(s) 404. In various implementations,the non-transitory computer readable media may be implemented using anysuitable memory technology, such as static random access memory (SRAM),synchronous dynamic RAM (SDRAM), nonvolatile/Flash-type memory, or anyother type of memory. In the illustrated example, program instructionsand data implementing desired operations, such as those described above,are shown stored within the non-transitory computer readable memory. Inother implementations, program instructions, and/or data may bereceived, sent, or stored on different types of computer-accessiblemedia, such as non-transitory computer readable media, or on similarmedia separate from the non-transitory computer readable media.Generally speaking, a non-transitory, computer readable memory mayinclude storage media or memory media, such as flash memory (e.g., solidstate memory), magnetic or optical media (e.g., a disk) coupled to theexample vehicle system 402 via an input/output (“I/O”) interface 408.Program instructions and data stored via a non-transitory computerreadable medium may be transmitted by transmission media or signals suchas electrical, electromagnetic, or digital signals, which may beconveyed via a communication medium such as a network and/or a wirelesslink, such as may be implemented via a network interface 410.

Furthermore, though illustrated as a single unit in FIG. 4 , it isunderstood that the processor(s) 404 and memory 406 may be distributedamong multiple computing devices of the vehicle and/or among multiplevehicles, data centers, teleoperation centers, etc.

In some examples, the input/output (“I/O”) interface 408 may beconfigured to coordinate I/O traffic between the processor(s) 404, thememory 406, the network interface 410, sensor(s) 412, I/O devices 414,drive system 416, and/or any other hardware of the vehicle system 402.In some examples, the I/O devices 414 may include external and/orinternal speaker(s), display(s), passenger input device(s), etc. In someexamples, the I/O interface 408 may perform protocol, timing, or otherdata transformations to convert data signals from one component (e.g.,the non-transitory computer readable media) into a format suitable foruse by another component (e.g., processor(s)). In some examples, the I/Ointerface 408 may include support for devices attached through varioustypes of peripheral buses, such as the Peripheral Component Interconnect(PCI) bus standard, the Universal Serial Bus (USB) standard, or avariant thereof, for example. In some implementations, the function ofthe I/O interface 408 may be split into two or more separate components,such as a north bridge and a south bridge, for example. Also, in someexamples, some or all of the functionality of the I/O interface 408,such as an interface to the memory 406, may be incorporated directlyinto the processor(s) 404 and/or one or more other components of thevehicle system 402.

The example vehicle system 402 may include a network interface 410configured to establish a communication link (i.e., “network”) betweenthe vehicle system 402 and one or more other devices. For example, thenetwork interface 410 may be configured to allow data to be exchangedbetween the vehicle system 402 and another vehicle 418 (e.g., vehicle(s)104(2) and (3), for example) via a first network 420, and/or between thevehicle system 402 and a remote computing system 422 via a secondnetwork 424. For example, the network interface 410 may enable wirelesscommunication between another vehicle 418 and/or the remote computingdevice 422. In various implementations, the network interface 410 maysupport communication via wireless general data networks, such as aWi-Fi network, and/or telecommunications networks, such as, for example,cellular communication networks, satellite networks, and the like.

In some examples, the sensor data discussed herein may be received at afirst vehicle and transmitted to a second vehicle. In some examples,sensor data received from a different vehicle may be incorporated intothe feature values determined by the perception engine. For example, thesensor data received from the first vehicle may be used to fill in afeature value that was unavailable to the second vehicle and/or toweight feature values determined by the second vehicle from sensor datareceived at the second vehicle.

The example vehicle system 402 may include sensor(s) 412, for example,configured to localize the vehicle system 402 in an environment, todetect one or more objects in the environment, to sense movement of theexample vehicle system 402 through its environment, sense environmentaldata (e.g., ambient temperature, pressure, and humidity), and/or senseconditions of an interior of the example vehicle system 402 (e.g.,passenger count, interior temperature, noise level). The sensor(s) 412may include, for example, one or more lidar sensors, one or more cameras(e.g. RGB-cameras, intensity (grey scale) cameras, infrared cameras,depth cameras, stereo cameras), one or more magnetometers, one or moreradar sensors, one or more sonar sensors, one or more microphones forsensing sounds, one or more IMU sensors (e.g., including accelerometersand gyroscopes), one or more GPS sensors, one or more Geiger countersensors, one or more wheel encoders, one or more drive system sensors, aspeed sensor, and/or other sensors related to the operation of theexample vehicle system 402.

The example vehicle system 402 may include a perception engine 426, a BVML model 428, and a planner 430.

The perception engine 426 may include instructions stored on memory 406that, when executed by the processor(s) 404, configure the processor(s)404 to receive sensor data from the sensor(s) 412 as input, and outputdata representative of, for example, one or more of the pose (e.g.position and orientation) of an object in the environment surroundingthe example vehicle system 402, an object track associated with theobject (e.g., a historic position, velocity, acceleration, and/orheading of the object over a period of time (e.g. 5 seconds)), and/or anobject classification associated with the object (e.g. a pedestrian, avehicle, a bicyclist, etc.). In some examples, perception engine 426 maybe configured to predict more than an object trajectory of one or moreobjects. For example, the perception engine 426 may be configured topredict multiple object trajectories based on, for example,probabilistic determinations or multi-modal distributions of predictedpositions, trajectories, and/or velocities associated with an object.

The perception engine 426 may include instructions stored on memory 406that, when executed by the processor(s) 404, configure the processor(s)404 to receive sensor data from the sensor(s) 412 as input, and outputan indication that the perception engine detects a stationary vehiclefrom the sensor data and may output one or more feature values. Thesefeature values may also be stored in the memory 406. For example, thismay include instructions configuring the processor(s) 404 to determine adistance between a stationary vehicle and a traffic light from an imageand/or a cloud of lidar points. The perception engine 426 may transmitthe feature values to the BV ML model 428.

The BV ML model 428 may include instructions stored on memory 406 that,when executed by the processor(s) 404, configure the processor(s) 404 toreceive feature values associated with elements of the environment inwhich the vehicle system 402 exists, and determine a probability thatthe stationary vehicle is a blocking vehicle. The BV ML model 428 mayinclude a decision tree(s), and/or deep learning algorithm(s), havingnodes through which feature values may be pushed to determine andoutput.

The perception engine 426 may transmit the probability that thestationary vehicle is a blocking vehicle to the planner 430 along withany other additional information that the planner 430 may use togenerate a trajectory (e.g., object classifications, object tracks,vehicle pose). In some examples, the perception engine 426 and/or theplanner 430 may additionally or alternatively transmit a blockingvehicle indication via the network interface 410 to the remote computingdevice 422 via network 424 and/or another vehicle 418 via network 420,based, at least in part, on the probability determined by the perceptionengine 426. In some examples, this indication may be used by anothervehicle 418 as a feature value if the vehicle 418 encounters astationary vehicle at the same location as indicated by the perceptionengine 426 of the vehicle system 402. In some examples, this may includetemporarily modifying a global map to include a blocking vehicleindication, where the global map is accessible via a network to a fleetof vehicles.

In some examples, the perception engine and/or the BV ML model 428 maybe located at another vehicle 418 and/or the remote computing device422. In some examples, a perception engine located at another vehicle418 and/or remote computing device 422 may coordinate determinationswith the perception engine 426. For example, the other vehicle 418and/or remote computing device 422 may determine one or more featurevalues and/or the probability. In an example where the other vehicle 418and/or remote computing device 422 determine one or more feature values,the other vehicle 418 and/or remote computing device 422 may transmitthe one or more feature values to the vehicle system 402 via networks420 and/or 424, respectively. The perception engine 426 may include theone or more feature values received from the other vehicle 418 and/orremote computing device 422 in feature values that the perception engine426 pushes through the BV ML model 428. In some examples where the BV MLmodel 428 is located at the other vehicle 418 and/or remote computingdevice 422, the other vehicle 418 and/or remote computing device 422 mayreceive one or more feature values from the vehicle system 402 vianetworks 420 and 424, respectively, and may determine a probability thatthe stationary vehicle is a blocking vehicle. The other vehicle 418and/or remote computing device 422 may then transmit this probabilityback to a planner 430 of the vehicle system 402.

In some examples, the remote computing device 422 may include ateleoperations device. The teleoperations device may be a deviceconfigured to respond to sensor data and/or one or more feature valueswith an indication of whether the stationary vehicle is a blockingvehicle. In additional or alternate examples, the teleoperations devicemay display information related to the sensor data and/or the one ormore feature values that may be useful for receiving an input from aremote operator (“teleoperator”) corroborating or identifying anindication that the stationary vehicle is/is not a blocking vehicle. Insuch examples, the teleoperations device may include an interface forreceiving input, such as an indication that the stationary vehicle is ablocking vehicle is a true positive or a false positive, from theteleoperator. In some examples, the teleoperations device may respond tothe autonomous vehicle and/or additional autonomous vehiclescorroborating the indication or identifying the indication as a falsepositive.

In some examples, a teleoperator may input a feature value into theremote computing device 422 that may transmitted to the vehicle system402 for use by the BV ML model 428 and/or input into a BV ML modellocated at the remote computing device 422.

The planner 430 may include instructions stored on memory 406 that, whenexecuted by the processor(s) 404, configure the processor(s) 404 togenerate data representative of a trajectory of the example vehiclesystem 402, for example, using data representing a location of theexample vehicle system 402 in its environment and other data, such aslocal pose data, and the probability that the stationary vehicle is ablocking vehicle. In some examples, the planner 430 may substantiallycontinuously (e.g., every 1 or 2 milliseconds, though any recedinghorizon time is contemplated) generate a plurality of potentialtrajectories with which to control the example vehicle system 402 andselect one of the trajectories with which to control the vehicle. Theselection may be based at least in part on a current route, theprobability that the stationary vehicle is a blocking vehicle, currentvehicle trajectory, and/or detected object trajectory data. Uponselecting a trajectory, the planner 430 may transmit the trajectory tothe drive system 416 to control the example vehicle system 402 accordingto the selected trajectory.

In some examples, the perception engine 426, the BV ML model 428, and/orthe planner 430 may further include specialized hardware such as, forexample, a processor that is suited to running the perception engine(e.g., a graphics processor, an FPGA).

Example Process

FIG. 5 illustrates a flow diagram of an example process 500 for traininga BV ML model according to techniques discussed herein.

At operation 502, the example process 500 may include receiving a samplethat includes sensor data associated with a label indicating astationary non-blocking vehicle or a stationary blocking vehicle,according to any of the techniques discussed herein. For example,thousands or tens of thousands of samples may be received, each sampleincluding sensor data for a discrete scenario and a label associatedwith the sensor data (e.g. blocking or non-blocking).

At operation 504, the example process 500 may include determiningfeature values for the sample based, at least in part, on the samplesensor data, according to any of the techniques discussed herein. Insome examples, determining the feature values from the sensor data mayinclude receiving a feature upon which to train the BV ML model—thisfeature may correspond to something the perception engine may classifyor otherwise determine (e.g., a condition of a traffic light, an objecttrack and/or classification, a distance to a junction)—and determining avalue for the feature from the sample data (e.g., for a sample thatincludes sensor data including a video where a traffic light is green,the perception engine may generate a feature value that corresponds tothe green light, such as the word “green” or a numeric value thatsymbolizes a green light). Feature value determination may be repeatedfor all the samples received at operation 502.

At operation 506, the example process 500 may include generating a BV MLmodel configured to output a probability that a stationary vehicle is ablocking vehicle based, at least in part, on the one or more featurevalues and the label associated with the sample, according to any of thetechniques discussed herein. For example, and depending on the type ofML model generated (e.g., decision tree(s), deep learning model),training the BV ML model may include generating nodes, connectionweights, node layers, and/or layer types that map input feature valuesto a label. The resultant BV ML model may thereby, at runtime, receive aset of feature values from the perception engine and output anindication that the stationary vehicle is or is not a blocking vehicle.In some examples, indication may include a probability (e.g., areal-valued number) that the planner may use to generate a trajectoryfor controlling the autonomous vehicle.

For example, for a higher-valued positive indication that the stationaryvehicle is a blocking vehicle, such as a probability that equals orexceeds 1, the planner might generate a trajectory that causes theautonomous vehicle to merge into a different lane. For a lower-valuedpositive indication that the stationary vehicle is a blocking vehicle,such as a probability that is less than 1, the planner might determine atrajectory to remain in position for a few more seconds beforere-evaluating or transmit a request for teleoperations assistance to aremote computing device. For either a higher-valued (greater than orequal to 1) or lower-valued (less than 1) negative indication that thestationary vehicle is a blocking vehicle, the planner may determine atrajectory to remain in position. It is contemplated that the actualvalues employed by the planner to take different actions will depend ona configuration of the planner.

FIG. 6 illustrates a flow diagram of an example process 600 fordetecting blocking vehicles. For example, the operations of exampleprocess 600 may be conducted by one or more processors of an autonomousvehicle or other components thereof and as described below.

At operation 602, the example process 600 may include receiving sensordata 604 from at least one sensor 412, according to any of thetechniques discussed herein. For example, the sensor data 604 may bereceived at the perception engine 426.

At operation 606, the example process 600 may include detecting astationary vehicle in an environment of the autonomous vehicle based, atleast in part, on the sensor data 604, according to any of thetechniques discussed herein. For example, this may include detectingexistence of an object in an environment of the autonomous vehicle,classifying the object as a vehicle, determining a speed of the vehicle,and determining that the speed of the vehicle does not satisfy apredetermined threshold speed. In additional or alternate examples, thismay include determining that the vehicle is impeding a previouslygenerated trajectory of the autonomous vehicle and/or determining thatthe vehicle impedes another vehicle that is also in the environment ofthe autonomous vehicle. One or more of these operations may includeinputting the sensor data 604 into a stationary vehicle detector 608,which may include one or more machine learning algorithms of theperception engine 426 or other components thereof. In some examples, astationary vehicle indication 610 may be generated (e.g., changing aregister or flag value, transmitting a command to another component ofthe perception engine 426).

At operation 612, the example process 600 may include determining one ormore feature values 614, according to any of the techniques discussedherein. For example, determining the one or more feature values 614 mayinclude (1) detecting one or more other vehicles on the road other thanthe stationary vehicle and the autonomous vehicle, and (2) determining afeature value that indicates as a speed of the stationary vehicle andspeeds of the one or more other vehicles. In some examples, this featurevalue may include an indication of whether the stationary vehicle'sspeed is anomalous compared of the one or more other vehicles and/or adistribution of traffic flow data indicating the speed of the stationaryvehicle and the speeds of the one or more other vehicles. In someexamples, a collection of various components of the perception engine426, referred to generally as a feature value generator 616 in FIG. 6 ,(e.g., various machine-learning algorithms that perform natural languageprocessing, object detection, object classification, object tracking)may determine the feature values 614 based, at least in part, on thesensor data 604 and/or the stationary vehicle indication 610.

In some examples, operation 612 may additionally include providing theone or more feature values 614 as input to an ML model (e.g., BV MLmodel 428), according to any of the techniques discussed herein.

At operation 618, the example process 600 may include receiving, fromthe ML model, an indication 620 that the stationary vehicle is ablocking vehicle or a non-blocking vehicle (i.e., BV indication 620 inFIG. 6 ), according to any of the techniques discussed herein. Forexample, the indication 616 may include a label (e.g., “blockingvehicle,” “non-blocking vehicle”) and/or a probability. In someexamples, the perception engine 426 may receive the indication 620and/or the BV ML model 428 or the perception engine 426 may transmittingthe indication 620 to a planner 430, according to any of the techniquesdiscussed herein. The planner 430 may, in some examples, additionally atleast one of receive sensor data 604, data from the perception engine426 (e.g., object classifications, object tracks), etc.

At operation 622, the example process 600 may include generatingtrajectory 624 for controlling motion of the autonomous vehicle,according to any of the techniques discussed herein. For example, theplanner 430 may generate candidate trajectories based, at least in part,on the indication 616, and select one of the candidate trajectories forcontrolling the autonomous vehicle. The planner 430 may transmit theselected trajectory to the drive system 416 of the autonomous vehicle.

FIG. 7 illustrates a flow diagram of an example process 700 fordetecting blocking vehicles. For example, the operations of exampleprocess 700 may be conducted by one or more processors of an autonomousvehicle or other components thereof and as described below and/or theoperations may be conducted by a remote computing system, such asanother autonomous vehicle and/or a teleoperations device.

At operation 702, the example process 700 may include receiving sensordata, according to any of the techniques discussed herein.

At operation 704, the example process 700 may identify a stationaryvehicle (i.e., the “YES” arm in the flow diagram), according to any ofthe techniques discussed herein. In some examples, if a stationaryvehicle is not identified, the process 700 may revert to operation 702.

At operation 706, the example process 700 may include determining one ormore feature values based, at least in part, on the sensor data,according to any of the techniques discussed herein. Any of the featurevalues discussed herein may be included. For example, one feature valueof the one or more feature values may include determining (706(A))traffic flow data indicating speeds of one or more vehicles detectedfrom the sensor data. This may include a speed of the stationary vehicleand/or speeds of other detected vehicles.

At operation 708, the example process 700 may include providing the oneor more feature values to a machine-learning model, according to any ofthe techniques discussed herein.

At operation 710, the example process 700 may include outputting, by themachine-learning model, a probability that the stationary vehicle is ablocking vehicle, according to any of the techniques discussed herein.

At operation 712, the example process 700 may include controlling thevehicle based, at least in part, on the probability, according to any ofthe techniques discussed herein. For example, this may includecontrolling the vehicle to pass a blocking vehicle (712(A)) orcontrolling the vehicle to wait for a non-blocking vehicle (712(B)).

Example Clauses

A. An autonomous vehicle comprising: at least one sensor; a drive systemto control physical operation of the autonomous vehicle; and aperception engine configured to perform operations comprising: receivingsensor data from the at least one sensor; detecting, based, at least inpart, on the sensor data, a stationary vehicle in an environment of theautonomous vehicle; determining one or more feature values based, atleast in part, on the sensor data, determine the one or more featurevalues including detecting, based, at least in part, on the sensor data,one or more other vehicles and speeds associated with the one or moreother vehicles and the stationary vehicle, wherein the one or morefeature values include a distribution of traffic flow data indicating aspeed of the stationary vehicle and the speeds of the one or more othervehicles; providing, as input to a machine-learning model, the one ormore feature values; receiving, from the machine-learning model, anindication that the stationary vehicle is a blocking vehicle or anon-blocking vehicle; and transmitting the indication to a planner,wherein the planner is configured to perform operations comprising:receiving the indication; and generating a trajectory for controllingmotion of the autonomous vehicle.

B. The autonomous vehicle of paragraph A, wherein detecting thestationary vehicle includes: detecting existence of an object in anenvironment of the autonomous vehicle; classifying the object as avehicle; determining a speed of the vehicle; and determining that thespeed of the vehicle does not satisfy a predetermined threshold speed.

C. The autonomous vehicle of paragraph A or B, wherein detecting thestationary vehicle further includes detecting one or more otherstationary vehicles within a predetermined threshold distance of theautonomous vehicle.

D. The autonomous vehicle of any of paragraphs A-C, wherein the one ormore feature values further include at least a speed of the stationaryvehicle and a traffic signal state.

E. The autonomous vehicle of any of paragraphs A-D, wherein the blockingvehicle is an object detected by the perception engine that obstructs atleast one of the autonomous vehicle or another vehicle from makingprogress.

F. A computer-implemented method of controlling a vehicle comprising:receiving sensor data from one or more sensors of the vehicle;identifying a stationary vehicle based, at least in part, on the sensordata; determining one or more feature values based, at least in part, onthe sensor data, one of the one or more feature values including trafficflow data indicating speeds of one or more vehicles detected from thesensor data; providing the one or more feature values to amachine-learning model; outputting, by the machine-learning model, aprobability that the stationary vehicle is a blocking vehicle; andcontrolling the vehicle based, at least in part, on the probability,wherein controlling the vehicle comprises: controlling the vehicle topass the blocking vehicle, or controlling the vehicle to wait for anon-blocking vehicle.

G. The autonomous vehicle of paragraph F, wherein the one or morefeature values include at least one of: a speed of the stationaryvehicle, a lane identification, a traffic signal state, a distance fromthe stationary vehicle to a next object in front of the stationaryvehicle; a distance from the stationary vehicle to a next road junction,traffic flow data, a vehicle track indicating a movement taken byanother vehicle with respect to the stationary vehicle, a sensorresidual that indicates presence of an occluded object, a classificationof at least one of the stationary vehicle or an object in theenvironment, a bounding box associated with the stationary vehicle; astate of a light of the stationary vehicle, an indication that a personis near the vehicle, a state of a door or aperture of the stationaryvehicle, a size of the stationary vehicle, or a yaw of the stationaryvehicle.

H. The autonomous vehicle of paragraph F or G, wherein themachine-learning model includes multiple decision trees configured to:receive the one or more feature values; push the one or more featurevalues through nodes of the decision trees to reach output nodesassociated with weighted values; and sum the weighted values todetermine the probability.

I. The computer-implemented method of any of paragraphs F-H, wherein themethod further comprises detecting a stationary vehicle in anenvironment of the vehicle based, at least in part, on the sensor data.

J. The computer-implemented method of any of paragraphs F-I, whereindetecting the stationary vehicle includes: detecting existence of anobject in an environment of the vehicle; classifying the object as avehicle based; determining a speed of the vehicle based; and determiningthat the speed of the vehicle does not satisfy a predetermined thresholdspeed.

K. The computer-implemented method of any of paragraphs F-J, wherein theone or more feature values are indicative of one or more characteristicsof at least one of the environment of the vehicle, the stationaryvehicle, or an object in the environment.

L. The computer-implemented method of any of paragraphs F-K, wherein:outputting the probability is based, at least in part, on detecting thestationary vehicle; and the probability indicates a likelihood that thestationary vehicle is obstructing the vehicle.

M. The computer-implemented method of any of paragraphs F-L, wherein theone or more feature values include at least one of a speed of thestationary vehicle, a state of a light of signal indicator associatedwith the stationary vehicle, a distance to a next road junction, a speedof at least one other vehicle, a distance between the stationary vehicleand a next vehicle in front of the stationary vehicle, or a trafficsignal state.

N. The computer-implemented method of any of paragraphs F-M, wherein themethod further comprises: determining based, at least in part, on thetraffic flow data that a speed of the stationary vehicle is anomalouscompared to speed of two or more other vehicles detected by theperception engine; and indicating, as one of the one or more featurevalues, an indication that the speed of the stationary vehicle isanomalous.

O. A non-transitory computer-readable medium having a set ofinstructions that, when executed, cause one or more processors toperform operations comprising: one or more processors; memory havingstored thereon a set of instructions that, when executed, cause the oneor more processors to perform operations comprising: receiving sensordata from at least one sensor; detecting a stationary vehicle; receivingone or more feature values; transmitting, to a machine-learning model,the one or more feature values; receiving, from the machine-learningmodel, a probability that the stationary vehicle is a blocking vehicle;and transmitting the probability to a planner of an autonomous vehicle,the planner configured to control motion of the autonomous vehiclebased, at least in part, on the probability.

P. The non-transitory computer-readable medium of paragraph P, whereindetecting the stationary vehicle comprises: detecting existence of anobject in an environment proximate the autonomous vehicle; classifyingthe object as a vehicle; determining a speed of the vehicle; anddetermining that the speed of the vehicle does not satisfy apredetermined threshold speed.

Q. The non-transitory computer-readable medium of paragraph O or P,wherein detecting the stationary vehicle further includes determiningthat the vehicle impedes a trajectory previously determined by theautonomous vehicle.

R. The non-transitory computer-readable medium of any of paragraphs O-Q,wherein the operations further comprise: receiving a plurality of pairsof sample feature values and sample indications, an individual sampleindication indicating a blocking vehicle or a non-blocking vehicle andthe pairs being derived from sample sensor data; and training themachine-learning model from the plurality of pairs by: generating aninput layer of nodes configured to receive the sample feature values;generating one or more hidden layers, the input layer of nodesconfigured to activate nodes of the one or more hidden layers; andgenerating an output layer configured to receive stimuli from nodes ofthe one or more hidden layers and to output the probability.

S. The non-transitory computer-readable medium of any of paragraphs O-R,wherein the one or more feature values include at least one of: a speedof the stationary vehicle, a traffic signal state, a distance from thestationary vehicle to a next object; a distance from the stationaryvehicle to a next road junction, a lane identification, a bounding boxof the stationary object, traffic flow data, a vehicle track indicatinga movement taken by another vehicle with respect to the stationaryvehicle, a sensor residual that indicates presence of an occludedobject, a classification of at least one of the stationary vehicle or anobject in the environment, a state of a light of the stationary vehicle,an indication that a person is near the vehicle, a state of a door oraperture of the stationary vehicle, a height of the stationary vehicle,or a yaw of the stationary vehicle.

T. The non-transitory computer-readable medium of any of paragraphs O-S,wherein the machine-learning model is one or more decision trees or adeep learning model.

Although the subject matter has been described in language specific tostructural features and/or methodological acts, it is to be understoodthat the subject matter defined in the appended claims is notnecessarily limited to the specific features or acts described. Rather,the specific features and acts are disclosed as example forms ofimplementing the claims.

The modules described herein represent instructions that can be storedin any type of computer-readable medium and can be implemented insoftware and/or hardware. All of the methods and processes describedabove can be embodied in, and fully automated via, software code modulesand/or computer-executable instructions executed by one or morecomputers or processors, hardware, or some combination thereof. Some orall of the methods can alternatively be embodied in specialized computerhardware.

Conditional language such as, among others, “can,” “could,” “may” or“might,” unless specifically stated otherwise, are understood within thecontext to present that certain examples include, while other examplesdo not include, certain features, elements and/or steps. Thus, suchconditional language is not generally intended to imply that certainfeatures, elements and/or steps are in any way required for one or moreexamples or that one or more examples necessarily include logic fordeciding, with or without user input or prompting, whether certainfeatures, elements and/or steps are included or are to be performed inany particular example.

Conjunctive language such as the phrase “at least one of X, Y or Z,”unless specifically stated otherwise, is to be understood to presentthat an item, term, etc. can be either X, Y, or Z, or any combinationthereof, including multiples of each element. Unless explicitlydescribed as singular, “a” means singular and plural.

Any routine descriptions, elements or blocks in the flow diagramsdescribed herein and/or depicted in the attached figures should beunderstood as potentially representing modules, segments, or portions ofcode that include one or more computer-executable instructions forimplementing specific logical functions or elements in the routine.Alternate implementations are included within the scope of the examplesdescribed herein in which elements or functions can be deleted, orexecuted out of order from that shown or discussed, includingsubstantially synchronously, in reverse order, with additionaloperations, or omitting operations, depending on the functionalityinvolved as would be understood by those skilled in the art.

It should be emphasized that many variations and modifications can bemade to the above-described examples, the elements of which are to beunderstood as being among other acceptable examples. All suchmodifications and variations are intended to be included herein withinthe scope of this disclosure and protected by the following claims.

What is claimed is:
 1. A method comprising: receiving sensor dataassociated with an environment associated with a vehicle; determining,based at least in part on the sensor data, an indication of traffic flowassociated with an object within a portion of the environment, whereinthe object is different than a stationary object; providing, as input toa machine-learning model, the indication; receiving, from themachine-learning model, a probability that the stationary object blocksa path of the vehicle or part of a roadway associated with the vehicle;and controlling the vehicle based at least in part on the probability.2. The method of claim 1, wherein the indication of traffic flowcomprises at least one of: a first distribution of at least one ofactions, headings, or velocities of objects in the portion of theenvironment; a second distribution of at least one of actions, headings,or velocities of objects of a same classification in the portion of theenvironment; a tail characteristic of the first distribution or thesecond distribution; an indication of whether at least one of a headingor velocity associated with the stationary object is in a tail of thefirst distribution or the second distribution; a percent of objectshaving a same heading or velocity as the stationary object based atleast in part on the first distribution or the second distribution; apercentile associated with a velocity of the stationary object based atleast in part on the first distribution or the second distribution; or afrequency with which another object in the portion of the environmentcompletes a type of action.
 3. The method of claim 1, furthercomprising: determining, based at least in part on the sensor data, anobject track associated with the object, wherein the object trackcomprises at least one of a current or historic heading and velocity ofthe object; and determining, based at least in part on the object track,that the object is currently or has been headed a same direction oftravel as the vehicle, wherein: determining the indication of trafficflow is based at least in part on the object track and determining thatthe object is currently or has been headed the same direction of travel.4. The method of claim 1, further comprising: determining, based atleast in part on the sensor data, an object detection associated withthe object, wherein the object detection comprises a classificationassociated with the object; and determining, based at least in part ontwo or more object detections indicating the classification, adistribution of an object track characteristic associated with the twoor more object detections, wherein the object track characteristiccomprises at least one of a current, historic, or predicted at least oneof position, heading, or velocity indicated by object tracks associatedwith the two or more object detections, wherein the distribution is partof the indication of traffic flow.
 5. The method of claim 1, furthercomprising determining a weight associated with the indication oftraffic flow based at least in part on a proximity of the object to thevehicle, wherein the weight is included in the indication of trafficflow.
 6. The method of claim 1, further comprising: controlling thevehicle to pass the stationary object based at least in part ondetermining that the probability meets or exceeds a thresholdprobability, or otherwise controlling the vehicle to maintain a currentaction or come to a stop.
 7. A system comprising: one or moreprocessors; and a memory storing processor-executable instructions that,when executed by the one or more processors, cause the system to performoperations comprising: receiving sensor data indicating an environmentassociated with a vehicle; determining, based at least in part on thesensor data, an indication of movement of an object within a portion ofthe environment, wherein the object is different than a stationaryobject; providing, as input to a machine-learning model, the indication;receiving, from the machine-learning model, a probability that thestationary object blocks a path of the vehicle or at least part of aroadway associated with the vehicle; and controlling the vehicle basedat least in part on the probability.
 8. The system of claim 7, whereinthe portion of the environment comprises at least one of a first lane inwhich the vehicle is located or a second lane next to the first laneassociated with an object track indicating that a second object moved inthe second lane in a same direction of travel as the vehicle.
 9. Thesystem of claim 7, wherein the indication of movement comprises at leastone of: a first distribution of at least one of actions, headings, orvelocities of objects in the portion of the environment; a seconddistribution of at least one of actions, headings, or velocities ofobjects of a same classification in the portion of the environment; atail characteristic of the first distribution or the seconddistribution; an indication of whether at least one of a heading orvelocity associated with the stationary object is in a tail of the firstdistribution or the second distribution; a percent of objects having asame heading or velocity as the stationary object based at least in parton the first distribution or the second distribution.
 10. The system ofclaim 7, wherein the operations further comprise: determining, based atleast in part on the sensor data, an object track associated with theobject, wherein the object track comprises at least one of a current orhistoric heading and velocity of the object; and determining, based atleast in part on the object track, that the object is currently or hasbeen headed a same direction of travel as the vehicle, wherein:determining the indication of movement is based at least in part on theobject track and determining that the object is currently or has beenheaded the same direction of travel.
 11. The system of claim 7, whereinthe operations further comprise: determining, based at least in part onthe sensor data, an object detection associated with the object, whereinthe object detection comprises a classification associated with theobject; and determining, based at least in part on two or more objectdetections indicating the classification, a distribution of an objecttrack characteristic associated with the two or more object detections,wherein the object track characteristic comprises at least one of acurrent, historic, or predicted at least one of position, heading, orvelocity indicated by object tracks associated with the two or moreobject detections, wherein the distribution is part of the indication ofmovement.
 12. The system of claim 7, wherein the operations furthercomprise determining a weight associated with the indication of trafficflow based at least in part on a proximity of the object to the vehicle,wherein the weight is included in the indication of traffic flow. 13.The system of claim 7, wherein the operations further comprise:controlling the vehicle to pass the stationary object based at least inpart on determining that the probability meets or exceeds a thresholdprobability, or otherwise controlling the vehicle to maintain a currentaction or come to a stop.
 14. A non-transitory computer-readable mediumstoring processor-executable instructions that, when executed by one ormore processors, cause the one or more processors to perform operationscomprising: receiving sensor data indicating an environment associatedwith a vehicle; determining, based at least in part on the sensor data,an indication of movement of an object within a portion of theenvironment, wherein the object is different than a stationary object;providing, as input to a machine-learning model, the indication;receiving, from the machine-learning model, a probability that thestationary object blocks a path of the vehicle or at least part of aroadway associated with the vehicle; and controlling the vehicle basedat least in part on the probability.
 15. The non-transitorycomputer-readable medium of claim 14, wherein the portion of theenvironment comprises at least one of a first lane in which the vehicleis located or a second lane next to the first lane associated with anobject track indicating that a second object moved in the second lane ina same direction of travel as the vehicle.
 16. The non-transitorycomputer-readable medium of claim 14, wherein the indication of movementcomprises at least one of: a first distribution of at least one ofactions, headings, or velocities of objects in the portion of theenvironment; a second distribution of at least one of actions, headings,or velocities of objects of a same classification in the portion of theenvironment; a tail characteristic of the first distribution or thesecond distribution; an indication of whether at least one of a headingor velocity associated with the stationary object is in a tail of thefirst distribution or the second distribution; a percent of objectshaving a same heading or velocity as the stationary object based atleast in part on the first distribution or the second distribution. 17.The non-transitory computer-readable medium of claim 14, wherein theoperations further comprise: determining, based at least in part on thesensor data, an object track associated with the object, wherein theobject track comprises at least one of a current or historic heading andvelocity of the object; and determining, based at least in part on theobject track, that the object is currently or has been headed a samedirection of travel as the vehicle, wherein: determining the indicationof movement is based at least in part on the object track anddetermining that the object is currently or has been headed the samedirection of travel.
 18. The non-transitory computer-readable medium ofclaim 14, wherein the operations further comprise: determining, based atleast in part on the sensor data, an object detection associated withthe object, wherein the object detection comprises a classificationassociated with the object; and determining, based at least in part ontwo or more object detections indicating the classification, adistribution of an object track characteristic associated with the twoor more object detections, wherein the object track characteristiccomprises at least one of a current, historic, or predicted at least oneof position, heading, or velocity indicated by object tracks associatedwith the two or more object detections, wherein the distribution is partof the indication of movement.
 19. The non-transitory computer-readablemedium of claim 14, wherein the operations further comprise determininga weight associated with the indication of traffic flow based at leastin part on a proximity of the object to the vehicle, wherein the weightis included in the indication of traffic flow.
 20. The non-transitorycomputer-readable medium of claim 14, wherein the operations furthercomprise: controlling the vehicle to pass the stationary object based atleast in part on determining that the probability meets or exceeds athreshold probability, or otherwise controlling the vehicle to maintaina current action or come to a stop.